Add Servers and PrivateKeys

Add new testhost
Remove privatekey injection from Dockerfile

app/Models/PrivateKey.php

@@ -4,8 +4,13 @@ namespace App\Models;
 
 class PrivateKey extends BaseModel
 {
-    public function private_key_morph()
+    public function private_keyables()
     {
-        return $this->morphTo();
+        return $this->hasMany(PrivateKeyable::class);
+    }
+
+    public function servers()
+    {
+        return $this->morphedByMany(Server::class, 'private_keyable');
     }
 }